CURLOPT_FNMATCH_DATA(3) on macOS

The text 240e677320a5, as macOS 10.12.5, macOS 10.12.4, macOS 10.12.3, macOS 10.12.2, macOS 10.12.1, macOS 10.12 shipped it.

custom pointer to fnmatch callback

CURLOPT_FNMATCH_DATA(3) on macOS now